A CRJ700 flight crew experienced GEAR DISAGREE CAS alert on approach. They ran the QRH; manually extended the gear; did a fly-by for visual confirmation; and landed normally.

Narrative

We were on the approach into ZZZ. When I asked for gear down; flaps 30 degrees; before landing checks; the gear did not deploy; and then we got Red Gear Disagreement CAS message. I asked to be taken off the final approach course and to be given vectors until we were done with our Quick Reference Handbook procedure and had devised a plan of action. At this time we declared an emergency and to have the trucks standing by. We ran the Quick Reference Handbook procedure; thus manually extending the gear. Once we performed this action; it took 10-30 seconds for the nose gear to deploy; and once we had our 3 green (3 green down and locked gear indications); I requested a low level fly-by to have Tower visually verify all 3 gear were down. Once they confirmed; along with other pilots in line for takeoff that indeed all 3 were down and locked; I requested immediate vectors onto final approach course to land. We were already landing on the longest runway; so we did not need to request the longest runway but informed the First Officer that I would be holding the nose gear off as long as feasible which would mean using more runway than normal. We landed without incident. After 5 or so seconds after the nosewheel made contact with the ground; we got Steering Inoperative Amber CAS message which the Quick Reference Handbook said we might see. I turned off on a high speed taxiway with the use of our rudders to clear the runway; and informed Ground Control that we would need to shut down the taxiway and wait to be towed to the gate.